Re: Pinhole sharpness.

Tom Ferguson (
Sun, 27 Jul 1997 08:50:40 -0700

The "shape" of your pinhole and its "focal length" will have a large
influence on your image sharpness. If you want a sharper image, make the
pinhole with a wire gauge drill, not a sewing needle. Make a few of them
in very thin brass shim stock, lay them on a light table, and choose the
most perfect circle (pinhole). I have also found it impossible to make a
very sharp long "focal length" pinhole. That is "focal length" being the
distance between the pinhole and the film. Sharp pinholes are wide angle
pinholes. (Tom Ferguson)

>On Mon, 14 Jul 1997 18:48:54 -0700, Allen G <> wrote:
>>Geoffrey V. Brown wrote:
>>> Well, I got my pinhole pictures back, and the exposures were almost dead
>>> perfect.
>>> Sharpness, on the other hand, left something to be desired. The
>>> material that I made the pinhole in was about 1mm thick. I think that
>>> this might have caused some reflections and so forth, but I'm not sure.
>>> Can anyone offer suggestions for improving the sharpness of the image?
>>> Does it have to do with the pinhole size, or something else?

Tom Ferguson (
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